/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.yarn;

import org.apache.flink.configuration.Configuration;

import org.apache.hadoop.yarn.client.api.YarnClient;
import org.apache.hadoop.yarn.conf.YarnConfiguration;

import javax.annotation.Nullable;

/**
 * Builder for the {@link YarnClusterDescriptor}.
 */
public final class YarnClusterDescriptorBuilder {

	private final YarnClient yarnClient;
	private final boolean sharedYarnClient;

	private Configuration flinkConfiguration = new Configuration();
	private YarnConfiguration yarnConfiguration = new YarnConfiguration();

	@Nullable
	private YarnClusterInformationRetriever yarnClusterInformationRetriever = null;

	private YarnClusterDescriptorBuilder(YarnClient yarnClient, boolean sharedYarnClient) {
		this.yarnClient = yarnClient;
		this.sharedYarnClient = sharedYarnClient;
	}

	public YarnClusterDescriptorBuilder setFlinkConfiguration(Configuration flinkConfiguration) {
		this.flinkConfiguration = flinkConfiguration;
		return this;
	}

	public YarnClusterDescriptorBuilder setYarnConfiguration(YarnConfiguration yarnConfiguration) {
		this.yarnConfiguration = yarnConfiguration;
		return this;
	}

	public YarnClusterDescriptorBuilder setYarnClusterInformationRetriever(YarnClusterInformationRetriever yarnClusterInformationRetriever) {
		this.yarnClusterInformationRetriever = yarnClusterInformationRetriever;
		return this;
	}

	public YarnClusterDescriptor build() {
		final YarnClusterInformationRetriever clusterInformationRetriever;

		if (yarnClusterInformationRetriever == null) {
			clusterInformationRetriever = YarnClientYarnClusterInformationRetriever.create(yarnClient);
		} else {
			clusterInformationRetriever = yarnClusterInformationRetriever;
		}

		return new YarnClusterDescriptor(
			flinkConfiguration,
			yarnConfiguration,
			yarnClient,
			clusterInformationRetriever,
			sharedYarnClient);
	}

	public static YarnClusterDescriptorBuilder newBuilder(YarnClient yarnClient, boolean sharedYarnClient) {
		return new YarnClusterDescriptorBuilder(yarnClient, sharedYarnClient);
	}
}
